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CVE-2022-23277: Microsoft Exchange Server Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 41.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-09 · updated 2026-06-17

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected products

• Microsoft Exchange Server: 2013-cumulative_update_23, 2016-cumulative_update_21, 2016-cumulative_update_22, 2019-cumulative_update_10, 2019-cumulative_update_11
• Microsoft Exchange Server 2013 Cumulative Update 23: from 15.00.0 before 15.00.1497.033 — fixed in 15.00.1497.033
• Microsoft Exchange Server 2016 Cumulative Update 21: from 15.01.0 before 15.01.2308.027 — fixed in 15.01.2308.027
• Microsoft Exchange Server 2016 Cumulative Update 22: from 15.0.0 before 15.01.2375.024 — fixed in 15.01.2375.024
• Microsoft Exchange Server 2019 Cumulative Update 10: from 15.02.0 before 15.02.0922.027 — fixed in 15.02.0922.027
• Microsoft Exchange Server 2019 Cumulative Update 11: from 15.02.0 before 15.02.0986.022 — fixed in 15.02.0986.022

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.033; Microsoft Exchange Server 2016 Cumulative Update 21 15.01.2308.027; Microsoft Exchange Server 2016 Cumulative Update 22 15.01.2375.024; Microsoft Exchange Server 2019 Cumulative Update 10 15.02.0922.027; Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0986.022. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-23277
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-23277

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